Circle Measurements Test Review

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

If the diameter of a circle is 19 inches, what is the radius?

Back

9.5 inches

Front

How do you calculate the radius from the diameter?

Back

Divide the diameter by 2.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × diameter.

Front

If the diameter is 12 inches, what is the circumference?

Back

12π inches.

Front

What is the area of a circle?

Back

The area is the space contained within the circle.

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

If the radius is 5 inches, what is the area of the circle?

Back

25π square inches.

Front

What does π (pi) represent in circle measurements?

Back

π is a constant approximately equal to 3.14, representing the ratio of the circumference to the diameter.